Muck Monster Pictures?

An unknown creature caught on video lurking beneath a lagoon in West Palm Beach, Fla., has the city wondering what it could be.

The mysterious creature was videotaped by the LagoonKeepers.org, a group that patrols the city's waterways in search of debris. "I hollered out ... and said, 'What is that?' We followed it, started taking video," said Greg Reynolds, a member of the group.